Cryptic crossword clue
Join again and be nicer, prepared to accept revolutionary MO 9

The most common and most likely answer to this crossword clue is the 9 letter word RECOMBINE

I've seen this crossword clue in The Times
R
E
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Buddy explains!

The straight part
We know that "Join again" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case join again = recombine.
The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.

What does RECOMBINE mean?

RECOMBINE verb
  1. To combine again, especially to reassemble the parts of something previously taken apart in a different manner.
  2. To undergo recombination.

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